Another IMS bearing thread

[Walter White]

Having an oil flow from the pump would be nice. If I were to use engine oil for lubrication, I figure 10cc/min would be enough to keep the bearing in oil, under certain conditions.
I am looking at vacuum powered pumps now.

[Jamesp]

Walter,

What are you doing to that poor engine? It looks a little... experimental.

[Walter White]

That was a minute ago, now I am back on grease. After playing with bearings over-packed with grease, I found out that they will just poop out the excess grease through the seals within a minute or two and remain perfectly happy. And heat just isn't a problem at the RPMs they will be turning.

[Walter White]

Originally Posted by Jamesp

Walter,

What are you doing to that poor engine? It looks a little... experimental.

Here's the latest experiment



Molded seal. I will try it out this weekend, after it fully cures.

[Jake Raby]

I decided to spend my time omitting the ball bearing, rather than applying a band aid :-)

[Jamesp]

What I like about you Walter, is that you work in that kingdom where great ideas come from. I think many may look at your ideas and think , "what the heck?". I know I do, some are downright scary to me, but that's the land where really inventive and great ideas come from. Keep it up!

[Walter White]

Thanks James. This IMS bearing thing has been fun.

Originally Posted by rp17

James, if I'm not mistaken, there is a fixt that sells a oil feed using something similar to what you describe.

If I were to go this route, this is the way I would want to do it





As I have mentioned, I think 10 cc/min would keep oil flowing out the bearing.

[bobclive]

Can a blanking plate be fitted before inserting the new IMS bearing. this would stop oil getting into IMS shaft and stop air pressure into bearing from inside shaft, just a thought.

[bobclive]

Jamesp,

Can you fit a blanking plate into end of IMS before fitting bearing.

[Jamesp]

Wow - a blast from the past! A couple of thoughts on the blanking plate:

The IMS shaft is a pressed assembly and a sealed blanking plate would turn it into a pressure vessel. one that gets temperature and pressure cycled every time the engine runs. That would likely disassemble the IMS tube over time with disastrous results.

The plate would be hard to seal, and would take up real estate on the IMS bearing bore the bearing needs, so the bearing would not fit without additional machining of the IMS shaft which would be complicated.

The IMS threads sure have legs!

I sprung for a Durametric (BUY ONE OF THESE!) and my valve timing is still rock solid after a couple thousand miles with my unique IMS bearing fix which is at least a start. Now I have cam sensor problem I'm chasing and it looks like something electronic crapped out. The engine harness buzzes out clean so I'm looking at the driver for the sensor. My thought is the sensor is not getting energized, just like my thought was the engine harness had a broken wire. Oh well, time will tell and it's a hobby. With luck I wont smoke my ECU searching for voltage. I'm thinking about documenting troubleshooting the camshaft sensor and posting it here as there is almost no information on it on this forum or the rest of the internet. Anybody interested?

[BobRickel]

My local indy mechanic has been working on these cars for years. His fix is the EPS fix shown in this video:
He charges $1400 to do this on cars with Tiptronic, which includes all parts and includes changing out the AOS, belt, and plugs.

[Blueboxster986]

Sorry guys but I'm really needing some help on this one. My 2002 986-S is about to send me to the poorer farm Anyone know of a good non-Dealer in Indianapolis or close who could handle my IMS replacement. 35,000 miles but I'm paranoid, it had been garaged for most of its life prior to my purchase at 29,000. I guess I should also take this opportunity to replace the clutch?

thanks in advance for any advice..

[mikefocke]

A list is available at Porsche Repair Shops & Mechanics Near Indianapolis IN | PCarShops.com.

Can't vouch for any of them. Ask your local PCA group or find out who preps M96 engines for racing in your area.

[Jake Raby]

Originally Posted by BobRickel

My local indy mechanic has been working on these cars for years. His fix is to pull the engine, center punch a hole from the front oil pressured side of the IMS and put in a roller bearing with no seals. The oil comes through the IMS shaft from the front pressurized side and flows through the roller bearing and out the rear side thus constantly lubricating the bearing with pressurized oil. He charges $1400 to do this on cars with Tiptronic, which includes all parts

The part he is center punching is the only thing holding the oil pump drive key from falling into the IMS shaft during operation. I see these failures occur without the assistance of a center punch.

It helps to understand the anatomy of the patient before performing the surgical procedure.

[Jamesp]

Originally Posted by BobRickel

My local indy mechanic has been working on these cars for years. His fix is to pull the engine, center punch a hole from the front oil pressured side of the IMS and put in a roller bearing with no seals. The oil comes through the IMS shaft from the front pressurized side and flows through the roller bearing and out the rear side thus constantly lubricating the bearing with pressurized oil. He charges $1400 to do this on cars with Tiptronic, which includes all parts

This looks eerily similar to post 192 in this thread, which seems to have some fatal, if yet undefined flaw. Looks good to me, but I'll punch holes in an IMS shaft with very little provocation. Careful with that oil pressure however!

[Boxe1]

Hello i made a big mess on my Boxster S 987 3.4 L
I remove the flange to change the rubber seal of IMS without locking the Crankshaft
and now the shaft is on a side.
What should i do now !
Please check the attached photos
Thank you in advance

[flaps10]

The problem isn't that you didn't lock the crankshaft, it's that you didn't undo the chain tensioner.

There are plenty of good detailed write ups on doing this job correctly. If you look at one you'll see you caused yourself a ton of extra work. You are now facing a complete cam timing job.

[78F350]

Originally Posted by Boxe1

Hello i made a big mess on my Boxster S 987 3.4 L
I remove the flange to change the rubber seal of IMS without locking the Crankshaft
and now the shaft is on a side.
What should i do now !
Please check the attached photos
Thank you in advance.

I think that happens to more than a few people.
I don't know if it will help, but read through this thread if you haven't already:
IMS Install help! IMS bearing not centered

Be very cautious how you proceed. As Flaps10 implied, you will probably have to release all the tension from your cam chains, recenter the shaft, then reset your cam timing. Trying to force anything or taking short-cuts will probably damage your engine and lead to more problems.

[Boxe1]

Originally Posted by flaps10

The problem isn't that you didn't lock the crankshaft, it's that you didn't undo the chain tensioner.

There are plenty of good detailed write ups on doing this job correctly. If you look at one you'll see you caused yourself a ton of extra work. You are now facing a complete cam timing job.

So i face a big problem now ,
Any other advice ?

[Boxe1]

Originally Posted by 78F350

I think that happens to more than a few people.
I don't know if it will help, but read through this thread if you haven't already:
IMS Install help! IMS bearing not centered

Be very cautious how you proceed. As Flaps10 implied, you will probably have to release all the tension from your cam chains, recenter the shaft, then reset your cam timing. Trying to force anything or taking short-cuts will probably damage your engine and lead to more problems.

Thank you i will check the link now ,
If you get any more info over forum , Appreciate let me know
Best regards